// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.

use std::num::NonZeroU32;

use deno_core::error::AnyError;
use deno_core::OpState;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use serde::Deserialize;

use super::error::WebGpuResult;

type WebGpuQueue = super::WebGpuDevice;

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct QueueSubmitArgs {
  queue_rid: ResourceId,
  command_buffers: Vec<ResourceId>,
}

pub fn op_webgpu_queue_submit(
  state: &mut OpState,
  args: QueueSubmitArgs,
  _: (),
) -> Result<WebGpuResult, AnyError> {
  let instance = state.borrow::<super::Instance>();
  let queue_resource =
    state.resource_table.get::<WebGpuQueue>(args.queue_rid)?;
  let queue = queue_resource.0;

  let mut ids = vec![];

  for rid in args.command_buffers {
    let buffer_resource =
      state
        .resource_table
        .get::<super::command_encoder::WebGpuCommandBuffer>(rid)?;
    ids.push(buffer_resource.0);
  }

  let maybe_err =
    gfx_select!(queue => instance.queue_submit(queue, &ids)).err();

  Ok(WebGpuResult::maybe_err(maybe_err))
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
struct GpuImageDataLayout {
  offset: u64,
  bytes_per_row: Option<u32>,
  rows_per_image: Option<u32>,
}

impl From<GpuImageDataLayout> for wgpu_types::ImageDataLayout {
  fn from(layout: GpuImageDataLayout) -> Self {
    wgpu_types::ImageDataLayout {
      offset: layout.offset,
      bytes_per_row: NonZeroU32::new(layout.bytes_per_row.unwrap_or(0)),
      rows_per_image: NonZeroU32::new(layout.rows_per_image.unwrap_or(0)),
    }
  }
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct QueueWriteBufferArgs {
  queue_rid: ResourceId,
  buffer: ResourceId,
  buffer_offset: u64,
  data_offset: usize,
  size: Option<usize>,
}

pub fn op_webgpu_write_buffer(
  state: &mut OpState,
  args: QueueWriteBufferArgs,
  zero_copy: ZeroCopyBuf,
) -> Result<WebGpuResult, AnyError> {
  let instance = state.borrow::<super::Instance>();
  let buffer_resource = state
    .resource_table
    .get::<super::buffer::WebGpuBuffer>(args.buffer)?;
  let buffer = buffer_resource.0;
  let queue_resource =
    state.resource_table.get::<WebGpuQueue>(args.queue_rid)?;
  let queue = queue_resource.0;

  let data = match args.size {
    Some(size) => &zero_copy[args.data_offset..(args.data_offset + size)],
    None => &zero_copy[args.data_offset..],
  };
  let maybe_err = gfx_select!(queue => instance.queue_write_buffer(
    queue,
    buffer,
    args.buffer_offset,
    data
  ))
  .err();

  Ok(WebGpuResult::maybe_err(maybe_err))
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct QueueWriteTextureArgs {
  queue_rid: ResourceId,
  destination: super::command_encoder::GpuImageCopyTexture,
  data_layout: GpuImageDataLayout,
  size: super::texture::GpuExtent3D,
}

pub fn op_webgpu_write_texture(
  state: &mut OpState,
  args: QueueWriteTextureArgs,
  zero_copy: ZeroCopyBuf,
) -> Result<WebGpuResult, AnyError> {
  let instance = state.borrow::<super::Instance>();
  let texture_resource = state
    .resource_table
    .get::<super::texture::WebGpuTexture>(args.destination.texture)?;
  let queue_resource =
    state.resource_table.get::<WebGpuQueue>(args.queue_rid)?;
  let queue = queue_resource.0;

  let destination = wgpu_core::command::ImageCopyTexture {
    texture: texture_resource.0,
    mip_level: args.destination.mip_level,
    origin: args.destination.origin.into(),
    aspect: args.destination.aspect.into(),
  };
  let data_layout = args.data_layout.into();

  gfx_ok!(queue => instance.queue_write_texture(
    queue,
    &destination,
    &*zero_copy,
    &data_layout,
    &args.size.into()
  ))
}
